Review on 💡 USB Tester Type C Meter - USB Digital Multimeter Amperage Power Capacity Reader & USB C Current Voltmeter & Voltage Monitor Tester & Amp Amperage Charging USB Detector Checker DC 0-30V/0-6.5A: Complete USB Testing Solution by Vivian Eker

Just what I needed: an inexpensive way to test chargers and cables to see if they support USB PD. For that he gets 5 stars. I don't need or appreciate a rugged device for everyday use by a constructor. I didn't need and don't appreciate an accurate and well calibrated gauge to design, test and/or operate critical equipment. I didn't need the advanced features (like amp hours) and didn't test them either. I've only used it to show real-time amps and volts, which is the best way to check chargers and/or cables. Price! The problem it solves: There's no good way to quickly determine how fast an iPhone is charging without an external meter. There are a few apps that claim this, but all they do is look at the battery percentage and do some math. This is both slow and unreliable. And as other reviewers point out, most USB-C to Lightning cables don't support fast charging, even if they claim to. Do you want to know exactly? Use this gauge. To test cables and/or chargers to ensure they support fast charging: Monitor the meter voltage. When it switches to 9 (approx) or 15 (approx) volts, it charges quickly. If it stays at 5 (over) volts, it's not. It is really that easy. This meter doesn't seem to interfere with the feedback loop that turns on USB PD. I've used it with multiple phones and chargers and it's worked great. I've had good success with Apple's USB-C to Lightning cable, but no other. Important note: For fast charging, the battery must be relatively empty. iPhone will charge to a 100% soft landing and will slow down as it nears full charge. That's why Apple claims "up to 50 percent battery in 30 minutes" rather than "full charge in an hour." <Brief Explanation of USB-PD> USB has become a "universal" power port for full charge. empty. That's good when you need to charge, but not very nice when you need to charge quickly. Charging requires watts - volts x amps - but the maximum you can get from a USB port is around 10 watts. This is because the cable and connector can only handle about 2 amps and regular USB only outputs 5 volts. But what if you could somehow increase the tension? If you could quadruple the voltage, you could quadruple the power—with the same connectors and cables! This is the concept of USB Power Delivery (USB-PD), an open standard adopted by Apple for charging next-generation MacBooks and MacBook Pros. (which require MUCH more than 10W of power!) with just one USB-C port. And Apple has also (with very little documentation) started supporting it for the iPhone, starting with the iPhone 8. If/when the USB PD charger somehow gets a message that the connected device is compatible, it will appear on all these devices work. Increase the voltage to 9 volts, 15 volts or even 20 volts and the device will charge much faster. times rated voltage! And since it's bad for businesses to fry other people's stuff, any decent charger will be limited to the good old 5V standard unless the connected device tells the charger via the charging cable that it has higher voltages can process. This means that the charging cable is just as important as the charger.</Brief Explanation of USB-PD>